A patents for Canon inner zoom 15-60mm f/2.8 and 22-80mm f/2.8 were found by asobinet. The
overview
- [Publication number] P2024079936
- [Release date] 2024-06-13
- [Name of invention] Zoom lens, and imaging device and imaging system having the same
- [Application date] 2022-12-01
- [Applicant]
[Identification number] 000001007
[Name or company name] Canon Inc. - A zoom lens that has a high zoom ratio and a large aperture ratio, yet is compact, lightweight, and provides high image quality, and that allows high-speed zoom operation.
- [Background Art]
[0002]
There is a demand for a zoom lens that is compact and lightweight throughout its entire system, has excellent correction of chromatic aberration and other aberrations, and has high optical performance. There is also a demand for a zoom lens that has a short focal length at the wide-angle end, a large zoom ratio, a small F-number, a large aperture ratio, and is easy to manufacture. There is also a demand for a zoom lens that allows high-speed zoom operation. - However
, the zoom lens described in Patent Document 1 has a tendency to have a large lens diameter due to its small F-number, and the large front lens diameter leads to an increase in size and weight. In addition, if the refractive power of the second lens group is increased in order to reduce the front lens diameter, it becomes difficult to achieve high image quality. - The present
invention provides a zoom lens that has a high zoom ratio and a large aperture ratio, yet is compact, lightweight, and provides high image quality, and is capable of high-speed zoom operation.
Example 1
- Focal length: 24.72-101.86
- F-number: 2.90
- Half angle of view: 41.19-11.99
- Total length: 212.40
- Back Focus: 11.98-21.74
Example 5
- Focal length: 15.45-58.20
- F-number: 2.90
- Half angle of view: 41.5-13.2
- Overall length: 144.55
- Back focal length: 13.62
Example 6
- Focal length: 24.71-116.38
- F-number: 2.90
- Half angle of view: 41.3-10.0
- Image height:
- Overall length: 231.23
- Back focus: 11.38-23.01
Example 7
- Focal length: 22.60-82.99
- F-number: 2.90
- Half angle of view: 44.3-14.1
- Image height:
- Overall length: 216.25
- Back Focus: 11.83-22.33
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